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transistor requirement

Can you recommend a surface mount transistor with a thermal resistance of 1mW/ºC for use as a flowmeter

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transistor requirement

That's correct. I would like to raise the transistor temperature by 25C using as little a power as possible, hence 25mW dissipation.I am monitoring VBE to assess the cooling effect of the airstream. A...

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Re: transistor requirement

Hey Caz, Do you have any other specifications? Transistor manufacturers usually spec thermal resistance as a function of RθJA.    

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transistor requirement

That being your application, I think I would have you look at part number BC857CT-7-F. http://www.diodes.com/datasheets/ds30275.pdf It has a high thermal resistance, while haveing one of our lowest...

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transistor requirement

Thanks a lot, Levy, that looks exactly what we were looking for. One more question, is the thermal barrier on the underside, in which case we should invert it to get best exposure to the airflow?

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transistor requirement

Hey Caz,  I don't know if there is room in your application, but how about soldering it to wire and have it floating?  That should minimize the heat sinking done by the PCB and give you more surface...

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transistor requirement

Thanks Levy, great idea

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